Two-wire type microphone with ultrasonic identification

Abstract

The invention discloses a two-wire type microphone with ultrasonic identification, comprising: an acoustic transducer for capturing an acoustic signal; a signal processing chip, connected to a signal output terminal of the acoustic transducer, wherein the signal processing chip comprises a signal output terminal pin, a ground pin and an ultrasonic generator, wherein the ultrasonic generator is the configured for generating an ultrasonic signal, and a control terminal of the ultrasonic generator is connected to the signal processing chip. The beneficial effects of the present invention includes: the ultrasonic signal generated by the ultrasonic generator is utilized to match the ultrasonic signal with the encoding unit in the signal processing chip for identification, and a remote authentication by the client is useful for matching the electronic device with the microphone. Furthermore, the signal output terminal pin and the ground pin are introduced into the microphone in the prior art, and the signal output terminal pin is also used for a communication line and a power line, thereby further saving the cost.

What is claimed is: 
     
       1. A two-wire type microphone with ultrasonic identification, comprising:
 an acoustic transducer for capturing an acoustic signal; 
 a signal processing chip connected to a signal output terminal of the acoustic transducer, wherein the signal processing chip comprises: 
 a signal Output terminal pin; 
 a ground pin; 
 an ultrasonic generator configured for generating an ultrasonic signal, wherein a control terminal of the ultrasonic generator is connected to the signal processing chip, 
 wherein the signal processing chip comprises an encoding unit configured to encode the ultrasonic signal to form an ultrasonic coded signal for transmission, and 
 wherein when the two-wire type microphone is inserted into an electronic device, a first interruption is introduced the ultrasonic generator generates the ultrasonic signal, and the ultrasonic signal is encoded by the encoding unit in the signal processing chip to form the ultrasonic coded signal. 
 
     
     
       2. The two-wire type microphone as claimed in  claim 1 , comprising: a voltage/current acquisition circuit, wherein an input terminal of the voltage/current acquisition circuit is connected to the signal output terminal pin for obtaining electric energy from the signal output terminal pin and storing the electric energy, and wherein an output terminal of the voltage/current acquisition circuit is configured for outputting the electric energy. 
     
     
       3. The two-wire type microphone as claimed in  claim 2 , further comprising: a bias power supply, wherein an input terminal of the bias power supply is connected to the output terminal of the voltage/current acquisition circuit for receiving the electric energy output from the voltage/current acquisition circuit, and for outputting a working voltage from an output terminal of the bias power supply; and
 wherein a power supply terminal of the acoustic transducer is arranged between the output terminal of the bias power supply and the ground pin. 
 
     
     
       4. The two-wire type microphone as claimed in  claim 1 , wherein the signal processing chip comprises:
 an amplifier, wherein an input terminal of the amplifier is connected to the signal output terminal of the acoustic transducer; and 
 a voltage follower, wherein an input terminal of the voltage follower is connected to an output terminal of the amplifier, and the output terminal of the voltage follower is connected to the signal output terminal pin. 
 
     
     
       5. The two-wire type microphone as claimed in  claim 1 , wherein the ultrasonic coded signal is an ultrasonic coded signal with a set time span. 
     
     
       6. The two-wire type microphone as claimed in  claim 1 , wherein the ultrasonic coded signal comprises an identification signal. 
     
     
       7. The two-wire type microphone as claimed in  claim 5 , wherein the set time span is 6 ms. 
     
     
       8. The two-wire type microphone as claimed in  claim 3 , further comprising: an encapsulation shell, wherein all of the acoustic transducer, the voltage/current acquisition circuit and the bias power supply are disposed inside the encapsulation shell, and wherein the signal output terminal pin and the ground pin extend from an interior of the encapsulation shell to an exterior thereof.